<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			
			try{
				// 将可能出现异常的代码放在try-catch
				console.log(document.forms.input.length);
			}catch(exception)
			{
				alert("捕获异常")
			}finally
			{
				console.log("finally");
			}
			
			console.log("脚本正常结束");
		</script>
	</body>
</html>